142444728 has 48 divisors (see below), whose sum is σ = 386711520. Its totient is φ = 47367936.

The previous prime is 142444711. The next prime is 142444763. The reversal of 142444728 is 827444241.

142444728 is a `hidden beast` number, since 142 + 44 + 472 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 142444692 and 142444701.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31200 + ... + 35472.

It is an arithmetic number, because the mean of its divisors is an integer number (8056490).

Almost surely, 2^142444728 is an apocalyptic number.

142444728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

142444728 is an abundant number, since it is smaller than the sum of its proper divisors (244266792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

142444728 is a wasteful number, since it uses less digits than its factorization.

142444728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4748 (or 4741 counting only the distinct ones).

The product of its digits is 57344, while the sum is 36.

The square root of 142444728 is about 11935.0210724573. The cubic root of 142444728 is about 522.2544230299.

Adding to 142444728 its reverse (827444241), we get a palindrome (969888969).

The spelling of 142444728 in words is "one hundred forty-two million, four hundred forty-four thousand, seven hundred twenty-eight".